Drennan, Robert D, Prehistoric social, political, and economic development in the area of the Tehuacan valley : some results of the Palo Blanco project - 259 páginas : ilustraciones - Technical Reports 11 . Subjects--Topical Terms: Desarrollo economicoPrehistoria politicaPrehistoria social Subjects--Geographic Terms: Valle de Tehuacan Dewey Class. No.: 571 / D73p